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The lifetime of the first excited 1B2u state of benzene has been determined from measurement of decay of fluorescence in the vapor phase. High-frequency electrical excitation, rather then optical excitation was used. The pressure dependence of the lifetime has been studied under different conditions. The lifetime extrapolated to zero pressure is 0.59 μsec. The pressure dependence is interpreted by a mechanism of collisional deactivation.
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Donovan et al. (1961) studied this question.
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